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1、RevealinganewchargedensitywaveorderinTbTe3byopticalconductivityandultrafastpump-probeexperimentsR.Y.Chen,B.F.Hu,T.Dong,N.L.WangBeijingNationalLaboratoryforCondensedMatterPhysics,InstituteofPhysics,ChineseAcademyofSciences,Beijing100190,ChinaRare-earthtri-telluriumRTe3isatypicalquasi-two
2、dimensionalsystemwhichexhibitsobviouschargedensitywave(CDW)orders.Sofar,RTe3withheavierRions(Dy,Ho,ErandTm)arebelievedtoexperiencetwoCDWphasetransitions,whilethelighteronesonlyholdone.TbTe3isclaimedtobelongtothelatter.HoweverinthisworkwepresentevidencesthatTbTe3alsopossessesmorethanoneC
3、DWorder.Asidefromtheoneat336K,whichwasextensivelystudiedandreportedtobedrivenbyimperfectFermisurfacenestingwithawavevectorq=(2/7c∗),anewCDWenergygap(260meV)developsataround165K,revealedbybothinfraredreflectivityspectroscopyandultrafastpump-probespectroscopy.Moreintriguingly,theoriginofth
4、isenergygapisdifferentfromthesecondCDWorderintheheavierRions-basedcompoundsRTe3(R=Dy,Ho,ErandTm).PACSnumbers:78.30.Er,78.40.Kc,75.50.CcI.INTRODUCTIONions(Dy,Ho,Er,Tm)areillustratedtoexperiencetwoCDWtransitions,11whilethelighteronesonlyundergoone.7Thesecondtransitionsoccuratlowertemperatu
5、reswithanestingCollectivephenomena,suchasdensitywavesandsuper-wavevectorwhosemagnitudeisalmostequaltothefirstoneconductivity,areoffundamentalimportanceincondensed∗butorientsatperpendiculardirection,alonga-axis.More-matterphysics.Thecoexistenceandcompetitionbetweenover,thetransitiontemper
6、atureevolvesinanoppositetrendinthemareamongthekeyissuesinanumberofhighlyin-contrasttothefirstone.Angleresolvedphotoemissionspec-terestedmaterials.Chargedensitywaveisasymmetrybro-troscopy(ARPES)revealsthatthefirstCDWtransitionisofkenstateofmetalinducedbyelectron-phononinteractions.imperfec
7、tnesting,thusasecondoneispossibleduetonestingAsthenameimplies,thechargedensityalongwiththelat-oftheremainingFS.Apartfromthat,thegappedareaofFSticedistortionareperiodicallymodulatedatitsgroundstate.causedbythefirsttransitiondecreasesasRradiumdecreas-CDWispredominantlydrivenbynest
